Self-healing property of concrete – experimental evidence.

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1、MaterialsandStructures/Mat6riauxetConstructions,Vol.30,August-September1997,pp404-411Self-sealingpropertyofconcreteExperimentalevidenceNatalyaHearn1,C.T.Morley2(I)AssistantProfessor,DepartmentofCivilEngineering,UniversityofToronto,Toronto,Ontario,CanadaM

2、5S1A4(2)SeniorLecturer,DepartmentofCivilEngineering,UniversityofCambridge,TrumpingtonStreet,EnglandCB2IPZPaperreceived:January24,1996;Paperaccepted:March21,1996ABSTRACIRESUMF:Leak-@tnessofconcreteisoftenjudgedintermsofOnpeutsouventdvaluerl'6tanchditdd'un

3、bdtonselontheD'Arcycoefficientdeterminedbytheflowofwaterlecoefficientd'Arcy,quiestddtermindparlepassagedethroughsaturatedconcreteataconstantrate.Inthecaseofl'eauatraversunbdtonsaturd27untauxconstant.Ceflowthroughsaturatedconcrete,thisrateoftenreducestaux

4、diminuegraduellementetpeutmettreuncertainwithtimeandreachingaconstantvaluemaytakemanyhombredejoursavantd'atteindreunevaleurconstant

5、untforthisbehaviour.Thececomportement.Lesrdsultatsconfirmentqueladissolu-resultsobtainedsupporttheconceptthatthedissolutiontionetlared@ositiondesalcalinsconstituelemdcanismeleandre&positionofalkalisisthemostsignificantmecha-plusimportantclansladiminution

6、graduelledupassagedenisminthetime-dependentreductionofflowofwaterinl'eauatraversunbdtonsaturd.Lapermdabitit6d'unbdtonsaturatedconcrete.Permeabilityofsaturatedconcreteandsatur6etsacapacit6adevenir6tanchepeuvent&reutilis&sself-sealingmaybeusedasmeasuresoft

7、he"immune"sys-commemesuredeson((syst~meimmunitaiw~)etdesontemsandpotentialdurabilityofdifferentconcretes.potentieldedurabilit(.>iiiiiiiill1.INTRODUCTIONever,hasshowedcontrarybehaviourinthatflowvariesduringpermeabilitytests.ConstantflowwasobtainedThemeasu

8、rementofsaturatedpermeabilityofconcreteonlyunderspecialconditions,suchasinwell-cured,haspresentedsomeexperimentaldifficulties,butmorenever-dried[3,4]orleached[5]specimens.Themostsig-importantly,thedifficultyhasbeenintheuse